Uncle Jesse was an '80s rocker (complete with mullet) on the classic sitcom Full House, so you know John Stamos had to catch a performance of Rock of Ages. Broadway-bound in Bye Bye Birdie, Stamos saw the show on June 2 (along with another special guest, South Park creator Matt Stone), then headed backstage at the Brooks Atkinson Theatre to pose with the stars. Rock on, John--and we'll see you in September as Albert Peterson.